<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div id="example">
        <p>Original message: "{{ message }}"</p>
        <p>Computed reversed message: "{{ reversedMessage }}"</p>
        <!-- //我们把复杂处理放在了计算属性里面了 -->
      </div>
    </div>
    <script src="lib/vue.js"></script>
    <script>
      var vm = new Vue({
        el: "#example",
        data: {
          message: "Hello"
        },
        computed: {
          reversedMessage: function() {
            // `this` 指向 vm 实例
            return this.message
              .split("")
              .reverse()
              .join("");
          }
        }
      });
    </script>
  </body>
</html>
